NHTSA Campaign Id 86V086000; Date: Jul. 7, 1986
1983 Chevrolet B6P042; 1984 Chevrolet B6P042; 1985 Chevrolet B6P042; 1986 Chevrolet B6P042; 1983 GMC B6P042; 1984 GMC B6P042; 1985 GMC B6P042; 1986 GMC B6P042
Component: Service Brakes, Hydraulic:fluid
Manufactured by: General Motors Corp.
Affected Units:: 4,299
Severe brake chatter may cause the brake chamber mounting brackets on either side to develop cracks in the weld area where the s-cam shaft tube attaches to the chamber support section. Consequence of defect: brackets can break, resulting in loss of braking ability at the front wheel, and possibly restrict steering, which could lead to a vehicle crash without prior warning.
As necessary, replace front brake chamber mounting brackets and install a front brake limiting valve.
System: brakes. Vehicle description: school buses equipped with a 7500 lb. Front axle and without a front brake limiting valve.
Date Owners notified by Manufacturer: Aug 15, 1986
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